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Method for preparing carbon nanometer tube/graphene three-dimensional nanometer structure capacitance desalination electrode

A carbon nanotube and three-dimensional nanotechnology, applied in the field of electrode desalination electrode manufacturing process, can solve the problems of graphene specific surface area reduction, serious graphene agglomeration, poor desalination performance, etc., and achieve simple preparation process, good desalination performance and good electrical conductivity sexual effect

Active Publication Date: 2012-05-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the theoretical specific surface area of ​​graphene is large, due to the strong van der Waals force between sheets, layer-to-layer lamination and agglomeration are prone to occur, which greatly reduces the specific surface area of ​​graphene, thus reducing desalination. performance
Pan et al. (L i H.B, Zou L.D. Lu T A comparative study on electrosorptive behavior of carbon nanotubes and graphene for capacitive deionization Journal of Electroanalytical Chemistry 653 (2011) 40–44) prepared a graphene desalination electrode, the graphene agglomeration is serious, The specific surface area is only 77 m 2 / g, poor desalination performance
Zou et al. (L i H.B, Zou L.D. Pan L.K. Novel Graphene-Like Electrodes for Capacitive Deionization Environ. Sci. Technol. 2010, 44, 8692–8697) prepared graphene desalination electrode agglomeration is relatively serious, reducing its desalination performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Under ice-water bath conditions, 3 g of graphite was slowly added to 120 mL of concentrated sulfuric acid with a mass fraction of 98% under stirring, and then 14 g of potassium permanganate was slowly added. The mass ratio of graphite: concentrated sulfuric acid: potassium permanganate was 1:40:4.7 at 35 o C in a constant temperature water bath, keep stirring for 2 h, after the reaction, slowly add 500 mL of deionized water to dilute, stir for a few minutes, press graphite:H 2 O 2 The mass ratio of 1:7.5 was added with 22.5 mL mass fraction of 30% H 2 O 2 , filtered after standing, fully washed the filter cake, washed to neutrality, and dried at room temperature to obtain graphite oxide. Multi-walled carbon nanotubes with a diameter of about 10-30 nm are mixed with ultrasonic waves for 2 h according to the mass ratio of graphite oxide: carbon nanotubes, and after uniform dispersion, they are extracted and dried. The mixture obtained above was preheated to 300 o In ...

Embodiment 2

[0019] Under ice-water bath conditions, 3 g of graphite was slowly added to 150 mL of concentrated sulfuric acid with a mass fraction of 98% under stirring, and then 21 g of potassium permanganate was slowly added. The mass ratio of graphite: concentrated sulfuric acid: potassium permanganate was 1:50:7 at 35 o In a constant temperature water bath at C, keep stirring for 3 h. After the reaction, slowly add 500 mL of deionized water to dilute, stir for a few minutes, and press graphite:H 2 O 2 The mass ratio of 1:8.3 was added with 25 mL of 30% H 2 O 2 , filtered after standing, fully washed the filter cake, washed to neutrality, and dried at room temperature to obtain graphite oxide. Multi-walled carbon nanotubes with a diameter of about 20-40 nm were mixed with ultrasonic for 1.5 h according to the mass ratio of graphite oxide: carbon nanotubes for 1.5 h, and after uniform dispersion, they were extracted and dried. The mixture obtained above was preheated to 200 o In the...

Embodiment 3

[0022] Under ice-water bath conditions, 4 g of graphite was slowly added to 240 mL of concentrated sulfuric acid with a mass fraction of 98% under stirring, and then 24 g of potassium permanganate was slowly added. The mass ratio of graphite: concentrated sulfuric acid: potassium permanganate was 1 :60:6 at 35 o C in a constant temperature water bath, keep stirring for 2 h, after the reaction, slowly add 500 mL of deionized water to dilute, stir for a few minutes, press graphite:H 2 O 2The mass ratio of 1:9 was added with 36 mL mass fraction of 30% H 2 O 2 , filtered after standing, fully washed the filter cake, washed to neutrality, and dried at room temperature to obtain graphite oxide. Multi-walled carbon nanotubes with a diameter of about 30-50 nm were mixed with ultrasound for 1.5 h according to the mass ratio of graphite oxide: carbon nanotubes for 1.5 h, and after uniform dispersion, they were extracted and dried. The mixture obtained above was preheated to 300 o I...

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Abstract

The invention relates to a method for preparing a carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode, which belongs to the field of the capacitance desalination electrode preparation. The method comprises the following steps that: firstly, graphite oxide / carbon nanometer tube high-stability dispersing liquid is obtained, and the graphite oxide / carbon nanometer tube compounds are fast peeled at a low temperature to obtain carbon nanometer tube / graphene three-dimensional nanometer compound materials. The carbon nanometer tube / graphene three-dimensional nanometer compound materials and polytetrafluoroethylene emulsion are uniformly mixed and coated on graphite paper, the carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode is prepared after being baked. The method has the advantages that the temperature is low, simplicity is realized, and the operation is easy. The obtained carbon nanometer tube / graphene three-dimensional nanometer structure capacitance desalination electrode has good conductivity and better desalination performance, and potential prospects are realized in the capacitance desalination aspect.

Description

technical field [0001] The invention relates to a method for preparing a carbon nanotube / graphene three-dimensional nanostructure capacitive desalination electrode. The desalination electrode prepared by the invention has desalination performance of high efficiency and low energy consumption. It belongs to the technical field of electric desalination electrode manufacturing technology. The invention can be used for the desalination of seawater and bitter alkali water, and the softening of industrial and agricultural production and domestic water (underground water). Background technique [0002] The water resource crisis is one of the biggest resource crises facing the world in this century, and desalination of seawater and brackish water is an important way to solve this crisis. The existing desalination methods mainly include distillation and membrane methods. The operation temperature of the distillation method is high, and the energy consumption is large; the scale haz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F5/00
Inventor 张登松施利毅颜婷婷张剑平
Owner SHANGHAI UNIV
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